 As well, in jazz, chordal musicians often omit the root, as this role is given to the bass player.The fifth of the chord is often omitted as well, if it is a perfect fifth above the root (as is the case in regular major chords and minor chords.The altered extensions played by a jazz guitarist or jazz pianist on an altered dominant chord on G might include (at the discretion of the performer) a flatted ninth A (a ninth scale degree flattened by one semitone); a sharp eleventh C (an eleventh scale degree raised by one semitone) and a flattened thirteenth E (a thirteenth scale degree lowered by one semitone).